DOMImplementation::hasFeature
(PHP 5, PHP 7)
DOMImplementation::hasFeature — Test if the DOM implementation implements a specific feature
说明
public DOMImplementation::hasFeature
( string
$feature
, string $version
) : bool
Test if the DOM implementation implements a specific
feature.
You can find a list of all features in the » Conformance section of the DOM specification.
参数
-
feature -
The feature to test.
-
version -
The version number of the
featureto test. In level 2, this can be either 2.0 or 1.0.
返回值
成功时返回 TRUE， 或者在失败时返回 FALSE。
错误／异常
此方法可以被静态调用,但会抛出一个 E_STRICT 错误。
范例
Example #1 Testing your DOM Implementation
<?php
$features = array(
'Core' => 'Core module',
'XML' => 'XML module',
'HTML' => 'HTML module',
'Views' => 'Views module',
'Stylesheets' => 'Style Sheets module',
'CSS' => 'CSS module',
'CSS2' => 'CSS2 module',
'Events' => 'Events module',
'UIEvents' => 'User interface Events module',
'MouseEvents' => 'Mouse Events module',
'MutationEvents' => 'Mutation Events module',
'HTMLEvents' => 'HTML Events module',
'Range' => 'Range module',
'Traversal' => 'Traversal module'
);
foreach ($features as $key => $name) {
if (DOMImplementation::hasFeature($key, '2.0')) {
echo "Has feature $name\n";
} else {
echo "Missing feature $name\n";
}
}
?>